Oscillators – Solid state active element oscillator – Transistors
Patent
1986-04-21
1987-06-09
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331143, 331153, H03K 3023, H03K 3282
Patent
active
046723323
ABSTRACT:
This high accuracy, RC oscillator, particularly for monitors, has different switch-over thresholds independent from such variable parameters as the saturating voltage of transistors, and has a high operating frequency. The oscillator comprises a capacitor having an output terminal, a capacitor power current source, and a control section. The control section is composed of a plurality of differential stages sharing a common input and each having an input connected to a different switch-over threshold. The control section further comprises a switch-over drive stage connected to the oscillator output terminal and to an input terminal thereof for controlling activation and deactivation of the different differential stages (and hence, of the respective associated thresholds) according to the signal present at the output and input terminals of the oscillator.
REFERENCES:
patent: 3659224 (1972-04-01), Ball
patent: 4407588 (1983-10-01), Arichi et al.
patent: 4590444 (1986-05-01), Wilcox
Coccetti Silvano
Gornati Silvano
Viscardi Roberto
Grimm Siegfried H.
Josif Albert
Modiano Guido
SGS Microelettronica S.p.A.
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